Revolving grizzly.



R. C. NEW/HOUSE.

REVOLVING GRIZZLY.

APPLICATION FILED IULY 6,19I4.

LIWD Mtented Apr. 13, 1915.

i :tisanes l MTR@ STATE@ Pdlllhlhll llflhllltjlil.

RAY C. NEWHOUSE, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS MANUFACTURING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

REVOLVING GRIZZLY.

Specification of Letters Patent.

Patented Apr. t3, i915..

Application led July 6, 1914. Serial No. 849,860.

T0 all 'w71 om it m (z i/ concern Be 1t known that I, RAY C. NnwHoUsn, a citlzen of the United States, residing at lll'ilwaukem in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Revolving Grizzlies, of which the following is a specification.

rl`his invention relates to improvements in the construction of grizzlies and is especially applicable to revolving grizzlies adapted for use in crushing plants wherever a rough separation of coarse and fine material is desired.

An object of the invention is to provide a revolving grizzly which is simple in construction and efiicient in operation.

(lneI of the more specific objects is to combine a. feeding means-with a grizzly of the drum type. for the separation of the ne material and to permit entry of this material through the drum, the drum being formed to permit relatively free discharge of the material from its interior.

Another object is to provide a grizzly of maximum capacity and in which the rate of separation of the fine from the coarse material may be readily altered.

It has heretofore beenproposed to construct a revolving grizzly of a circular series of parallel bars rotatable about a. central shaft. This device is objectionable since some of the fine material which passes through the spaces between adjacent bars will not pass readily from the interior of the grizzly during exit. This undesirable result is due to the fact that a piece of material which passes through the space between parallel bars at one time may so alter its position that it will not pass freely through the same space at another time, but instead will become wedged between the bars. ln order to avoid this undesirable result, the adjacent bars of the grizzly forming the subject of the present invention, are placed at an angle to each other, thus rendering the space between successive bars of greater width at the discharge end of the bars than at the inlet portion of the grizzly. The means for feeding the material is located adjacent the portion of the grizzly where the openings between adjacent bars are na-rrowest, while the discharge from the grizzly extends throughout the entire length thereof. In this manner the discharge opening from the grizzly is considerably larger than the inlet opening leading thereto, thus assuring a rapid passage of the fine material through the device.

lll/'bile thc drawing discloses a grizzly drum comprising a plurality of bars converging toward a central plate or disk, it should be understood that the invention as claimed is intended to cover any grizzly in which a feeder coperates with a drum in such a manner as to permit entry of the fine material through the drum, the drum being formed to permit freer exit of the Inaterial from its interior.

A clear conception of an embodiment of the invention may be had by referring t0 the' drawing accompanying and forming a part of this specification in which like reference characters designate the same or similar parts in the several views.

Figure l is a front view of a revolving grizzly showing fragments of the supporting bearings in section, and showing also fragments of the storage bin und discharge chute.. Fig. 2 is a transverse vertical section through the grizzly, the section heilig taken on the line ll-ll of Fig. l, the figure. also showing a. section through the storage bin, the feed chute and the discharge chute.

ln the embodiment of the invention disclosed in the drawing, the grizzly comprises a. plurality of longitudinal elements or bars (l arranged to form a substantially cylindrical drum. The bars 6 are arranged in two circular sets having their adjacent ends connected to the intermediate member or disk 10 and having their outer ends connected to the cnd members or disks 4. The disks 4, l0, are eoncentricallv mounted upon a. rotatable shaft l which is supported in the bearings The. shaft 1, disks 4, 10, and bars 6 arc revoluble by means of a driving cable 3 which coacts with a suitable sheave Q connected to one of the end members or disks 4. 'lhe adjacent bars (i are placed at an angle to each other, thus rendering the space between them of increasing width proceeding longitudinally of the bars and toward the' disks 1l. By this arrangement of the bars 6, a grizzly having a mid portion of considerably smaller diameter than its end portion, is produced.

adjacent bars G. fall by gravity The retainer for the unsepariited material, which is disclosed as a'storage bin 8l` is filled with the material which contains a mixture of large l'iieces 11 and small pieces l2. The storage bin 8 is provided with a discharge opening which delivers the Inaterial onto a feeding chute 7. The chute 7 is directed toward the mid portion of the grizzly at an angle of approximately-45 degrees. The feed chiite 7 is of considerably less width than the length of the grizzly, thus conning the feed tothe narrowest portions of the spaces between the grizzly bars 6. Adjacent the lower side of the grizzly and substantially in line with the feeding chute 7 is located the discharge chute 9 for yconveying away the large pieces 11 of the material.

During the normal operation of the grizzly, the drum is rotated in an anticlock# wise direction as indicated by the arrow in Fig. 2, by means of power applied through the driving cable 3. The material to be separat-ed is discharged from the storage bin 8 by gravity and slides down the feeding chute 'f against the upper bars 6 of the rotating drum. As the grizzly bars move past the lower end of the chute 7, the pieces l2 of the material which are small enough to pass directly through the spaces between the through these spaces and into the interior of the grizzly drum. The large pieces 1l are carried over the top of the drum by the forward movement of the bars 6 until they reach a position where gravity will cause them to drop upon the discharge chute 9 which conveys them away. After the pieces l2, which in the present case constitute the fines, pass through the spaces between the upper bars G, they fall through the interior of the drum and strike the bars 6 in the lower portion thereof. If the pieces 12 of the material thus passing through the interior of the drum are small enough to pass directly through the spaces between the lower bars 6 at the portions thereof which the material first strikes, the pieces pass directly through these spaces and are discharged :from the grizzly. Some of the piecesr 'l2 may, however, so shift their position during their passage through the interior of the drum that instead of passing directly through the spaces between the adjacent lower bars G, they tend to lodge between these bars. Due. to the longitudinal widening of the discharge spaces and of the longitudinally.k free formation thereof, the pieces l2- which tend to lodge betweenthe lower bars are urged toward the ends of the grizzly drinn by the action of gravity and by the impact of other pieces falling against them, until they reach a point in the space between the adjacent bars through Wliihthey can readily pass and be' freely discharged 'from the interior of the grizzly.

vThen the grizzly is at rest the material from the storage hin 8 builds up upon the teething chute and rests against the upper bars 6 of the drum. The rate of discharge of the material from the storage bin 8 is approximately proportional to the rate of rotation of the grizzly, so that the rate of separation and of the discharge of the material from the storage bin 8 is dependent upon the rate of rotation of the grizzly drinn.. This feature of the present invention permits utilization of the grizzly as ay feeder, the rate of feeding being alterable by varying the rate ot' rotation of the drum.

By forming the grizzly with a feeding -mid portion of relatively small diameter and with end portions of large diameter, and feeding the material to the portion of small diameter, the large pieces of material tend to remain' near the mid portion of the drinn and outward movement of these pieces toward the ends of the drum is gravitationally opposed.

Although the drawing discloses a grizzly drinn formed of circular series of bars (3, the adjacent bars being disposed at an :ingle to each other to form a drum having a mid portion of reduced diameter, it should be understood that the invention includes within its scope any modification of the drum whereby a feeding means for material combines with the drum to separate from the material the fines for entry therethrough, the drinn being formed to permit passage of material therefrom more freely for exit than during entry.

While it is deemed unnecessary to illustrate specific modifications of the form of the invention as shown, it is intended to include such modifications within the scope of this invention. It should therefore be understood that it is not desired to be limited to the exact details herein shown and described for various modifications may occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patentr- 1. In a grizzly, a feeding means for material combined with a drum for separating from theA material Athe fines for entry through said drum, said drinn being formed to permit passage of material therefrom more freely for exit than for entry thereof into said drum.

2. In a grizzly, a feeding means for material combined with a. drum for separating from the material the fines for entry through said drum, said drum being formed to permit passage of material therethrough more freely for exit than for entry thereof into said drum.

3., In a grizzly, a feeding means for ma- Lisanne terial combined with a drum for separating from the material the fmes for entry through said drum, said drum being formed to permit passage of material therethrough more freely for exitthan for entry thereof into said drum, and means for rotating said drum.

e. ln a grizzly, a plurality of spaced bars arranged to form a drum, and feeding means for material combined with said drum for separating from the material the fines for entry to said drum through the vspaces between said bars, said spaces being formed to permit passage of material therethrough more freely for exit than for entry thereofl into said drum.

5. In a grizzly, a plurality of spaced bars arranged to form a drum, feeding means for material combined with said drum for separating from the material the fines for entry to said drum through the spaces between said bars` saidspaces being formed to permit passage of material therethrough more freely for exit than for entry thereof into said drum, and means for rotating said drum.

6. n combination, a drum having a portion forming a free passage for fine mat-erial theretl'irough and having another portion forming a freer passage for fine material therethrough, means for feeding fine and coarse material to said first mentioned portion, said means being so disposed and said drum being formed to oppose the passage of said coarse material toward said second mentioned portion, and means for rotating said drum.

7. ln combination, a drum having a portion permitting passage of only fine material therethrough and having another portion permitting freer passage of fine material therethrough, means for feeding tine and coarse material to said first mentioned portion, the feed side of said drum being gravitationally disposed to oppose the passage of material toward said second mentioned portion, and means for rotating said drum.

8. In combination, a plurality of spaced bars arranged to form a drum, the spaces between adjacent bars increasing in width proceeding longitudinally of said drum, means for feeding material only to the outside of said drum at the narrowest portion of said spaees, means for conveying away one of the separated portions of said material, and means for rotating said drum.

9. l'n combination. a drum having a peripheral opening thereinto increasing in width proceeding longitudinally of said drum, means for feeding material only to the outside of said drum at the narrowest portion of said opening, means for conveying away one of the separated portions of said material, and means for rotating said drum.

10. In combination, a revoluble series of elements having longitudinally free spaces between them, adjacent elements of said series being arranged at an angle to each other to render the spaces therebetween of increasing width proceeding longitudinally of said elements, means for feeding material to the narrowest portions of said spaces, and means for revolving said elements.

l1. ln combination, a plurality of spaced end members revoluble about an axis, a. plurality of spaced bars connecting said members, the spaces between said bars being of greatest width adjacent said end members, means for feeding material to said spaces, and means for revolving said members and said bars.

ln testimony whereof, the signature of the inventor is ailixed hereto in the presence of two witnesses. y

RAY C. NEVHOUSE.

Witnesses:

W. ll. Linnen, Ro. E. SroLL. 

